Description: Midwest Industries Emergency Rear Flip Sight. This sight features a A2 style dual aperture which is fully protected from accidental damage. This rear sight is manufactured from 6061 hard coat anodized aluminum to withstand the most extreme conditions. The windage knob is the same style as a standard M-16: .65 MOA on M-4 type rifles / .49 MOA on A-4 type rifles. The locking detent features double the locking surface for maximum strength. This sight is proudly made in the USA and backed by a lifetime warranty through Midwest Industries.